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Kumar Muthukumar, MBBS, DMRD, DNB, FRCR, EDiR; Vinu Moses, MBBS, MD; Shyamkumar Nidugala Keshava, MBBS, DMRD, DNB, FRCR, FRANZCR; Aswin Padmanabhan, MBBS, MD, FNVIR Christian Medical College, Vellore, Tamil Nadu, India